Adding to the whole Colonizer/Immigrant interplay in TOH, this does remind me of how while Luz wants to learn magic, it isn't just immediately, freely handed out to her all willy-nilly. She has to learn to respect the Demon Realm's inhabitants and the Titan herself, Luz has to learn on their terms too.
Her first glyph, Light, came when Luz realized she needed to pay more attention to King and respect him as a demon, encouraging his own fascination with the demons of the isles, and by extension valuing a part of this culture that she initially dismissed and did not care for.
And for her second spell, Luz needed to show she was willing to be patient and learn from the Titan on his terms, rather than just taking the training wand and calling it a day. Luz still has to prove herself, the isles and its people aren't just obligated by the narrative to immediately hand this out to her just because she asked; Luz isn't entitled to their way of life, it's up to the isles to choose to share things with her. And while she does want to learn, Luz also prioritizes respecting and caring about other people, too.
And I dig that, especially since Luz is following off of a white colonist who DID seize and colonize the resources of the realm without any respect; Philip acts salty that the Titan hid magic from him, but what would you expect when you demand and appropriate with the most racist intentions? There's no work in brute-forcing your way through another culture's boundaries, that's just being an impersonating thug.
Amity goes on a whole rant during the Covention about how Luz doesn't really respect the practice of being a witch, that she's treating this as some game she can just walk into and own immediately, when this means a lot to the native witches and demons... And Luz definitely acknowledges that this is an important thing to consider, while showing Amity that she understands this and HAS put in the work.
Again, it's about respecting another culture and its inhabitants if you want to participate in it, instead of expecting them to be automatically open and handing over everything. Luz has to earn Amity's trust before they can be friends, and eventually lovers. Even after earning one glyph, she still has to earn the remaining spells, one at a time, before finding the combos is put into Luz's hands.